ray tomlinson

from The Free On-line Dictionary of Computing (8 July 2008)

Ray Tomlinson

   <person> An engineer at {Bolt Beranek and Newman} who, in July
   1972 while designing the first[?] {electronic mail} program,
   chose the {commercial at} symbol "@" to separate the user name
   from the computer name.

   (2004-08-22)